Method of making composite valves



"Dec. 6, 1932. COLWELL 1,889,916

-METHOD OF MAKING COMPOSITE VALVES Filed May 20, 1951 w 0 a a /6 /6 /6 Ira/(1219760520655.

Patented Dec. 6, 1932 UNITED STATES PATENT, orrlca ARCHIE T. COLWELL, OI CLEVELAND, OHIO, ASSIGNOB TO THOMPSON PRODUOTS,

INCORPORATED, OF OLE'VELAIJ'D, OHIO, A CORPORATION OF OHIO METHOD 0]! MAKING COMPOSITE VAL'VFFS Application filed May 20, 1931. Serial No. 588,787.

This invention relates to a method of sealvalve which is provided with a heat conduct-1 ing insert from the hot gases of the exhaust chamber.

It is a further object of this invention to provide a simple and expedient method of sealin an aperture in a metal body by puddlmg metal in the aperture.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawingf A This invention (in a preferred form) is illustrated in the drawing and hereinafter more fully described.

012. the drawing Fi ure 1 is a cross-sectional view of a re P cess lank used in making a valve according to my invention.

igure 2 is a cross-sectional view of the blank of Figure lshowing 'a metallic insert in the recess thereof.

Figures 3,4 and 5 illustrate steps in the carr g out of my process.

- Figure 6 is, a cross-sectional view of a valve formed in acordance with my invention.

As shown on the drawing In carrying out this invention, a suitable blank 1 of tungsten steel, nickle-chromium steel or other suitable valve material is formed by forging or cutting a slug fromrolled stock.. he blank 1 is recessed at 2.

The recess 2 is preferably cylindrical and conunderstood that the insert 3 may be melted and poured into recess 2.

The composite blank thus formed from the blank 1 and insert 3 is then forged by any suitable method, such as extruding. In this operation, a head 5 and a stem 6 are formed on the blank. The metal of insert 3 is drawn out to form the core 7 in the stem and a portionthereof is spread out into the head as shown at 8. This operation leaves a recess or aperture 9 in the, head 5 which in the ordinar course of the extruding process is filled wit the insert metal. This metal is removed from the aperture 9 by any suitable method as by drilling. Molten metal 11, prefierably of the same composition as the metal of the valve blank, is then poured into the a erture 9 and allowed to unite with the meta of the head 5. Excess metal 11 is scraped from the top of the valve.

The partially formed valve is then reforged and machined to obtain the finished roduct. In this last operation, pressure is applied to the head 5 and metal 11 to firmly bond them. As a result, the. head 12 of the finished valve presents, a homogeneous appearance.

, A valve formed by this method is shown in Figure 6. The valve comprises a head 12, a stem 13, the stem having a core 14 of a heat conducting metal therein. A portion of the metal core 14 is spread out in the head as shown at 15. Such a valve is particularly useful in high speed engines where it is neces- Silly to draw the heat from the head of the v ve.

In such operation, it has been found that the sealed head formed by my method remains firmly bonded under the most severe operating conditions.

It will be seen that I have provided a method of making a valve which is simple and expedient, w ich does not require an machinery other than is necessary in or inary valve makin and which will form a valve capable of wit standing the severe conditions of use in high. pressure, high speed automo- I itive engines.

- I am aware that many changes may be made and numerous det of construction may be varied through a wide ranpiel lwithout departing from the rinciples oft 's invention, and. I, therefore, 0 not purpose limitingthe patent granted hereon otherwise than necessitated by the prior arm.

-I claim as my invention: 1. The method of making a metal cooled valve, which comprises partially filling a recessed blank with a metal having a relatively high rate'ofhe at conductivity, forging the blank, puddling a molten metal into the opening of the recess and reforging the valve.

2. The method of making a metal cooled valve which comprises forging a metal blank containing an insert of softer metal, replacing part of the softer metal by a hard metal and reforging to incorporate the hard metal into the valve.

3. The method of making a metal cooled valve which comprises forging a metal blank containing an insert of a metal of relatively high rate'of heat conductivity to provide a partially finished valve having a core of said insert metal extending through the head thereof, removing a portion of said core, filling the recess thus formed with molten metal of the same com osition as that of the blank and reforging the blank to form a finished valve.

4. The method of sealing a recessin the head end of a valve having a'soft metal insert extending through part of the head por tion which comprises paddling a molten metal in the recess and reforging the valve. as In testimony whereof I have hereunto subscribed m name at Cleveland, Cuyahoga County, 0 iio.

. ARCHIE T. COLWELL'. 

